Question
What is a transformer? Write down its working principle and construction.
✓
Answer
→The device using which alternating voltage can be changed from one to another of greater or smaller value, is called a transformer.
• Principle :
→Electro magnetic induction (Mutual induction)
• Construction :
→A transformer consists of two sets of coils, insulated from each other. They are wound on a soft iron core, either on top of the other as in fig. (a) or on separate limbs of the core as shown in (b).
→One of the coils is called the primary coil and the other is called the secondary coil.
→Number of turns in the coils are $N _{ P }$ and $N _{ S }$ respectively.
→Often, the primary coil is the input coil and the secondary coil is the output coil of the transformer.
→When an alternating voltage is increased using a transformer, it is called step up transformer, and if the voltage is decreased, the transformer is known as step down transformer.
• Principle :
→Electro magnetic induction (Mutual induction)
• Construction :
→A transformer consists of two sets of coils, insulated from each other. They are wound on a soft iron core, either on top of the other as in fig. (a) or on separate limbs of the core as shown in (b).
→One of the coils is called the primary coil and the other is called the secondary coil.
→Number of turns in the coils are $N _{ P }$ and $N _{ S }$ respectively.
→Often, the primary coil is the input coil and the secondary coil is the output coil of the transformer.
→When an alternating voltage is increased using a transformer, it is called step up transformer, and if the voltage is decreased, the transformer is known as step down transformer.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The minimum deviations suffered by red, yellow and violet beams passing through an equilateral transparent prism are 38.4°, 38.7° and 39.2° respectively. Calculate the dispersive power of the medium.
Provide the classification of semi-conductors with example.
A deuteron and an alpha particle having same momentum are in turn allowed to pass through a magnetic field $\vec{B}$, acting normal to the direction of motion of the particles. Calculate the ratio of the radii of the circular paths described by them.
→A boy is seated in a revolving chair revolving at an angular speed of 120 revolutions per minute. Two heavy balls form part of the revolving system and the boy can pull the balls closer to himself or may push them apart. If by pulling the balls closer, the boy decreases the moment of inertia of the system from 6kg-m2 to 2kg-m2, what will be the new angular speed?
Figure, shows a person standing somewhere in between two identical tuning forks, each vibrating at 512Hz. If both the tuning fbrks move towards right at a speed of 5.5m/s, find the number of beats heard by the listener. Speed of sound in air = 330m/s.
The susceptibility of a magnetic material is –2.6 × 10–5. Identify the type of magnetic material and state its two properties.
Find the maximum Coulomb force that can act on the electron due to the nucleus in a hydrogen atom.
Taking force, length and time to be the fundamental quantities find the dimensions of:
- Density.
- Pressure.
- Momentum.
- Energy.
Write the difference between $p$-type and n-type semiconductors.
→Using lens maker’s formula, derive the thin lens formula $\frac{1}{\text{f}}=\frac{1}{\text{v}}-\frac{1}{\text{u}}$ for a biconvex lens.
→